Aluminum alloy of high resistance



Patented 7, 192s.-

HENRI nnm'r, or rants, rnmca.

' ALUMINUM ALIlOY OI 'EIGH RESISTANCE.

17o Drawing.- Application nled February 25, 1926, Serial No. 90,857, andin Germany February -19, 1925.

'.The subject of this invention is a new very light aluminum alloydistinguished by its high tensile strength and high-co-eflicient ofexpansion. It is completely homogeneous and can be repeatedly meltedwithout affectinglits strength and expansion.

xperiments have shown that the best proportions are as follows 2 parts bwei ht of co er.

0.37 'pa'rts by eight of dickel. .027 parts-by weight of tungsten.

0.45 parts'by wei ht of magnesium. 96.91 parts by weig t ofaluminum.

- The alloy can be conveniently produced in the following manner.

An alloy of qopperfnickel and tungsten inby casting in moulds have atensile strength of about 22 kgs. per square mm. and in a length of 100mm. have an expansion of about 6%. After being forged stamped or rolled,test bars formed from the same alloy after being heated to incandescenceand cooledin air show a tensile strength of about 20 kgs. per square mm.and 25% expansion.

The composltion of thealuminum. alloy may be altered within certainlimits so that the proportions may vary as follows 1.5 to 5 arts by weihtof co per,

0.3 to 3 parts by wei ght of nickel,

0.2 to 2 parts by weight of tungsten,

0.2 to 2 parts by weig t of ma esium, and 97.8 to 88 parts by weight ofa uminum,

.geneous and stable aluminum alloys of which -square mm. with 5' to 10%"expansion.

forging, stamping or rolling the tensile one can be used in moltencondition while others again forged, stamped or rolled may be employedwith advantage and the properties of which in substance are those of theallo first described.

oreover these alloys possess after casting a tensile-strength of 22 to27 kgs. er

strength is increased to to kgs. per

square mm. with 20 to 25% expaitsion.

Thus, for example, an alloy formed of 2.5 parts b weight of copper 0.75parts y Wei ht of nicke 0.25 parts by weig t of tungsten,

0.50 parts by weight of magnesium, and- 96 parts by weight of aluminum,

was rolled after casting and produced test bars which after being heatedto incannum alloy capable of being subjected to repeated melting withoutlosing its character- 1stic properties, said alloy having substantiallythe following composition:-

2 parts by weight of cop er 0.37 parts by weiglllit of nickel,

0.27 parts by weig t of tungsten, 0.45 parts by welght of magnesium,

96.91 parts by weight of commercial alnminum,

with 2 to 0.5% impurities, cast test bars showing a tensile strength of22 kgs. per sinare mm. with 6% expansion and test/bars o the forged,stamped orrolled alloy showing a tensile strength of 30 kgs. per squaremm. with 23% expansion.

2. An aluminum alloy as claimed in claim I, the composition of whichmodified and consisting of 1.5 to 5 parts by weight ofcop r,

is, however, bars having a tensile strength of 22 to 27 kgs. per squaremm. with 5 to 10% ex ansion and test bars -of forged stampe or rolledalloy having a tensile strength of 35 0.3 \to 3 parts by weight of mo e11 0.2 to.2-part sbby weiglhtgf tungsien, 2; 55: Per square I with 20 b025% 0.2 to-2 parts yweig t 0 magnesium 97.8 to 88 parts by weight ofcommercial m i zgi I w hereunto set aluminum, g 1 with about 2 to 0.5%impurities, HENRI BENIT.

